Re: [GRASS-user] GRASS 7.0.0 Issues with Object Based Image Analysis

Micha Silver Fri, 15 May 2015 12:11:53 -0700

Just a python comment. (I'm not sure it will make any difference, but it makes the "run_command" cleaner)
See below:

On 05/15/2015 05:02 PM, Jake Chila wrote:

Actually, scratch that. The script ran once, but now when I run it from the GUI it doesn't actually update the table, it just runs through without doing anything.

JDC

On Fri, May 15, 2015 at 10:56 AM, Jake Chila <[email protected]> wrote:

HI all,

Here is the code I am running:

MAPS = grass.read_command('i.group',

group='LE7_SEG',

flags='g',

quiet=True).splitlines()

for maps in MAPS:

band=maps.split('@',1)[0]

bnum=band[-2:]

# Set variables for the column names
col = bnum+"_median"
qcol = "bright"+col

grass.run_command('v.build',

map='LE7_2001_SEG',

option='build')

grass.run_command('v.rast.stats',

map='LE7_2001_SEG',

flags='c',

raster=band,

method='median',

column_prefix='%s' % bnum)

It seems to me that the '%s' is unnecessary here. bnum should already be a string variable so "column_prefix = bnum" should be fine.

grass.run_command('v.db.update',

map='LE7_2001_SEG',

column='bright',

qcolumn='bright+%s_median' %bnum)

Here just use: "qcolumm = qcol" (from above)

grass.run_command('v.db.dropcolumn',

map='LE7_2001_SEG',

column = '%s_median' % bnum)

And here "column = col" (from above)

Thanks,

JDC

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Re: [GRASS-user] GRASS 7.0.0 Issues with Object Based Image Analysis

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